Thread-guide.



No. 878,944 PATENTED DEG. 17,1907. N, JOHNSON. 'THRBAD GUIDE.

APPLIOATION FILED MAR. 29, 1907.

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NELSON JOHNSON, OF CHICAGO, ILLINOIS.

THREAD-GUIDE.

Specification of Letters Patent.

Patented Dec. 17, 1907.

Application filed March 29. 1907. Serial No. 3651273- To all whom it may concern:

Be it known that I, NELSON J OHNSON, citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Imrovements in Thread-Guides, of which the following is a specification.

This invention is a thread guide and tension for sewing machines, and consists of a device adapted to hold the spool and to be placed on the s 001 pin of a sewing machine.

It consists o" a bottom plate on which the spool rests, and having at one side an upwardly-extending curved arm against which the thread bears, and having on the other side a spring lip to keep the spool in place on the device.

The invention is illustrated in the accompanying drawings, in which Figure 1 is a perspective view of the device removed from the spool holder. Fig. 2 is a side elevation showmg the same in place.

Referring specifically to the drawings, 10 indicates the spool holder of a sewing machine, having a vertical pin 11 to receive the spool 12 carrying the thread 13.

The thread guide consists of a bottom plate 14 having a central hole 15 so that it may be placed over the spool pin. At one side edge the plate is provided with an upwardly-extending curved arm 16 against the concave edge of which the thread bears as it is fed from the spool. On the opposite side edge is a spring finger 17, offset in position to engage over the lower end or flange of the s 001.

In use the device is placed on the pin under the spool, and the thread is engaged against the arm 16. The friction between the bottom of the spool and the plate 14, as the spool turns, tends to turn the device so that the arm bears against the thread; that is, the tendency of the plate to turn with the spool causes a pressure against the thread, which tension continues to exist while the spool is unwinding, and keeps the thread taut at all times, preventing the spool from spinning around or unwinding more thread t an is needed. At each pull on the thread the plate will turn back or yield suflicient to release the V ressure to a certain extent. The varying pu l of the machine on the thread is thus automatically accommodated by the oscillation of the arm. This prevents slack thread or tangles.

Should the spool jump in consequence of the ull ofthe machinethe plate, by reason of t e engagement of the finger 17, Will lift with it, so that the spool and the guide are always held together in proper relation, without danger of the thread running loose. No preliminary adjustment or threading of the thread through the guide is necessary, since the turn of the spool will carry the plate around until the arm strikes the thread, thereby saving the time necessary to thread an eye, slot, or the like.

I claim:

A thread guide anol'tension device for sewing machines, comprising a plate mounted upon the spool pin of the mac ine, under the spool, and free to turn on said pin, said plate having at its edge an upwardly-extending curved arm to engage the thread and also having a projecting spring finger to engage the lower flange of the s 001.

In testimony whereof affix my signature, in presence of two witnesses.

NELSON JOHNSON.

Witnesses: h

WM. J. ROBINSON, NELLIE FELTSKOG. 

